What type of equipment is typically not involved in the transmission of signals?

Passive equipment is typically not involved in the transmission of signals in a way that actively influences the signal. Instead, it serves a more foundational role in supporting and managing signal paths without adding power to the signals. This type of equipment includes items like connectors, cables, splitters, and other passive components that do not amplify or otherwise modify the signal they carry.

In contrast, active equipment refers to devices that do require external power and can amplify or otherwise process the signals. Analog and digital equipment can also be categorized as active, as they can involve components that do manipulate signals, whether in analog or digital form. Therefore, passive equipment stands out as the correct answer as it plays a role in facilitating the transmission of signals without actively modifying or boosting them.